I tried to execute the sample script that you given but i am getting invalid command name "lassign". –ANR May 13 '14 at 13:40 1 Your expect must be pretty Can this number be written in (3^x) - 1 format? while : bar & [ "$pid" != "$!" ]; do :;done wait "$pid"; echo "$?"' which will (eventually) give you 0 instead of 12. share|improve this answer answered Jul 9 '09 at 5:28 Amadeus45 75421326 1 It's always 11 because the kernel kills it and assigns the "exit value." Likewise, other types of Faults Source

true\" = $?" # 1 # Note that the "!" needs a space between it and the command. # !true leads to a "command not found" error # # The '!' How should I respond to absurd observations from customers during software product demos? Why isn't the religion of R'hllor, The Lord of Light, dominant? What is this blue thing in a photograph of a bright light?

Linux Get Exit Code Of Background Process

For a number it waits num*5 seconds. Should we eliminate local variables if we can? How that exit code is assigned to the status variable $? He has been working with Linux and Unix for over 10 years now and has recently published his first book; Red Hat Enterprise Linux Troubleshooting Guide.

System.exit(int status).

done echo "" # Now wait for each monitored process and check return status with expected failed=0 for i in 1 2 3 4 do wait ${plist[$i]} rv=$?

Contrary to what they claim, status 2 is what your command line utilities actually return when called improperly.

What in the world happened with my cauliflower?

Taxiing with one engine: Is engine #1 always used or do they switch? more hot questions question feed about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science I am running Ubuntu Dapper Drake Linux.Keep it coming, it is good stuff.Rob Reply Link Rob April 3, 2007, 6:59 pmG'day again,Nope, I was wrong the script works I didn't copy Bash Set Exit Code Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the

POSIX requires that a shell remembers the exit status of at least 25 jobs after they're gone, but bash remembers a lot more than that. How could I make it work? Why are copper cables round? By not defining proper exit codes you could be falsely reporting successful executions which can cause issues depending on what the script does.

Thus if you run wait, it will gather the job at the time wait is called. Bash Script Exit On Error If that's what that is about... –jurchiks Feb 12 '11 at 19:33 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote accepted The exit code of You can use exit status in shell scripting too. Why does the U-2 use a chase car when landing?

Bash If Exit Code Not 0

linux bash shell unix expect share|improve this question edited May 12 '14 at 16:24 Jonathan Leffler 453k62523839 asked May 12 '14 at 16:18 ANR 98118 Try putting expect part With Bash scripts, if the exit code is not specified in the script itself the exit code used will be the exit code of the last command run. Linux Get Exit Code Of Background Process Thanks, Mad MAx.I made the correction.Peter August 4, 2009 at 8:50 PM Anonymous said... Shell Script Exit Code I'm always getting zero as success.

Well-behaved UNIX commands, programs, and utilities return a 0 exit code upon successful completion, though there are some exceptions.

Likewise, functions within a script and the script this contact form Actions such as printing to stdout on success and stderr on failure. Must still be running. asked 7 years ago viewed 73051 times active 10 months ago Linked 1 echo “.” until command finishes executing 0 check the return status of a background script 1 How to Linux Return Code 1

wait $my_pid my_status=$? They are available in the link. –joeytwiddle Oct 14 '16 at 2:26 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Compiling multiple LaTeX files How do you express any radical root of a number? have a peek here Next, if command makes decision based upon exit status stored in OUT variable.

What's the point of repeating an email address in "The Envelope" and the "The Header"? Exit Code 0 If n specifies a non-existent process or job, the return status is 127. does not change the execution of the pipe. # Only the exit status changes. # =========================================================== # # Thanks, Stéphane Chazelas and Kristopher Newsome.

Instead of just giving you information like some man page, I hope to illustrate each command in real-life scenarios. share|improve this answer edited Oct 11 '16 at 1:43 answered Oct 10 '16 at 2:57 joeytwiddle 9,76734349 2 Is this related to the question in any way? exit $?

So, unfortunately, the unix powers that be don't seem to enforce any logical set of rules, even on very commonly used executables. A list of signals can be found in the signal man page (run "man signal"). Electrical Propulsion Thrust Should we kill the features that users are not using frequently, to improve performance? Electrical Propulsion Thrust Difference between if else and && || Why do the physical properties of an egg shell change when the egg shell is exposed to vinegar for a week?

It doesn't actually send any signal, only checks that the process is alive, using a shell built-in instead of external processes. fi } 3< logfile 2>&1; echo "$?") share|improve this answer edited Sep 28 '15 at 20:11 answered Feb 20 '14 at 14:07 Stéphane Chazelas 190k32316551 add a comment| up There is a more unixesh solution, catching the SIGCHLD signal. done ....

After wait returns, the exit code of the process is returned in the variable $? 2, 3: ps or ps | grep " $! " can tell you whether the process Useful info and explained well!